absolute zero

noun

: a theoretical temperature characterized by complete absence of heat and motion and equivalent to exactly −273.15°C or −459.67°F

Examples of absolute zero in a Sentence

Recent Examples on the Web
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The department maintains an absolute zero-tolerance policy for any actions that compromise our core values, our strict ethical standards, or the public trust. Karen Morfitt, CBS News, 30 June 2026 Most applications require ultra-cold temperatures of absolute zero (-273 degrees Centigrade) to operate in. Ameya Paleja, Interesting Engineering, 25 June 2026 The researchers chilled a rubidium-87 atom to near absolute zero and immobilized it inside an optical tweezer. IEEE Spectrum, 21 June 2026 The scientists entangled two qubits kept at temperatures near absolute zero at the opposing ends of a 30-meter-long tube. Adam Kovac, Scientific American, 27 May 2026 See All Example Sentences for absolute zero

Word History

First Known Use

1798, in the meaning defined above

Time Traveler
The first known use of absolute zero was in 1798

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Cite this Entry

“Absolute zero.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/absolute%20zero. Accessed 5 Jul. 2026.

Kids Definition

absolute zero

noun
: a hypothetical temperature that has never been reached, represents no heat at all, and is equal to approximately −273.15°C or −459.67°F

Medical Definition

absolute zero

noun
: a theoretical temperature characterized by complete absence of heat and equivalent to exactly −273.15°C or −459.67°F

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